Question

您好，为什么我的代码会出现此错误？

线程“主”中的异常java.lang.Error：未解决的编译问题：类型不匹配：无法从String转换为int 这是我的代码：

import java.util.*;

public class matchScore{

  public static void main(String[] args){

    String opt;
    String home_team_name;
    String away_team_name;
    int home_team_score;
    int away_team_score;

    String[] name = new String[10];
    int[] score = new int[10];

    System.out.println("Retype an option:\n");
    System.out.println("Home teams");
    System.out.println("Away teams");
    System.out.println("Outputs");

    Scanner scan = new Scanner(System.in);

    opt = scan.nextLine();

    if(opt == "Home teams"){
      System.out.println("Entre first home team name: ");
      name[0] = scan.nextLine();
      System.out.println("Entre first home team score: ");
      score[0] = scan.nextLine();

      System.out.println("Entre second home team name: ");
      name[1] = scan.nextLine();
      System.out.println("Entre second home team score: ");
      score[1] = scan.nextLine();

      System.out.println("Entre third home team name: ");
      name[2] = scan.nextLine();
      System.out.println("Entre third home team score: ");
      score[2] = scan.nextLine();

      System.out.println("Entre forth home team name: ");
      name[3] = scan.nextLine();
      System.out.println("Entre forth home team score: ");
      score[3] = scan.nextLine();

      System.out.println("Entre fifth home team name: ");
      name[4] = scan.nextLine();
      System.out.println("Entre fifth home team score: ");
      score[4] = scan.nextLine();

      System.out.println("Entre sixth home team name: ");
      name[5] = scan.nextLine();
      System.out.println("Entre sixth home team score: ");
      score[5] = scan.nextLine();

      System.out.println("Entre seventh home team name: ");
  name[6] = scan.nextLine();

      System.out.println("Entre seventh home team score: ");
      score[6] = scan.nextLine();
    }
  }
}

我不明白为什么要这么做。我可以想象这很简单，只是看不到fs。

Answer 1

使用

score[0] = scan.nextInt();

代替

score[0] = scan.nextLine();

as score []是int []的数组。

还可以使用.equals比较字符串。更改 opt == "Home teams"至opt.equals("Home teams")

Answer 2

您期望输入中包含字符串，并尝试将其转换为整数。您可以通过执行scan.nextInt()来解决此问题，或者在每次调用需要整数的值时进行Integer.valueOf(scan.nextLine())来解决此问题

Answer 3

无论何时使用扫描仪，它都会自动认为它是字符串。因此改为： name [0] = Integer.valueOf（scan.next（））; 这会自动将其转换为数字。

类型不匹配：无法从字符串转换为整数-Java

3 个答案: